Manufacture of glass sheets.



PATENTED DEC. 12, 1905. J. H. LUBBERS & S. L. BODINB. MANUFACTURE OFGLASS SHEETS.

APPLICATION FILED 00T- 19,1904.

3 SHEETS-SHEET 1.

"memoirs No. 807,298. PATENTED DEC. 12, 1905.

J. H. LUBBERS & s. L. BODINE.

MANUFACTURE OF GLASS SHEETS.

ArPLioAnoN mum 00T.19,1904.

3 SHEETS-SHEET 2.

WH'NESSES INVENTORS No. 807,298. PATENTED DBG.12,1905. J. H. LUBBBRS &s. L. BODINE.

MANUFACTURE OF GLASS SHEETS.

APPLICATION FILED 001.19,1904.

3 SHEETS-SHEET 3.

v UNITED STATES PATENT orrroa.

JOHN H. LUBBERS, OF ALLEGHENY, AND SAMUEL LAURENCE BODINE,

OF BERWVYN, PENNSYLVANIA, ASSIGNORS TO WINDOW GLASS MA- CHINE COMPANY,OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF NEW JERSEY. Y

MANUFACTURE OF GLASS SHEETS.

Specification of Letters Patent.

Patented Dec. 1 2, 1905.

Application filed October 19, 1904. Serial No. 229,084.

1'0 alt whmn it may concern:

Be it known that we, JOHN H. LUBBERS, of Allegheny, Allegheny county,and SAMUEL LAURENCE BoDINE, of Berwyn, Chester county, Pennsylvania,have invented a new and useful Improvement in the Manufacture of GlassSheets, of which the following is a full, clear, and exact description,reference beinghad to the accompanying drawings, forming part of thisspecification, in which Figure l is a longitudinal vertical sectionshowing a portion of apparatus constructed in accordance with ourinvention. Fig. 2 is a horizontal cross-section of the same, and Fig. 3is a vertical cross-section showing the manner of drawing.

Our invention relates to the drawing of glass sheets or similararticles, and is designed to provide a simple and cheap method therefor.

Heretofore in the drawing of glass sheets or similar articles it hasbeen considered necessary to draw the sheet or sheets upwardly into agaseous bath or inclosed atmosphere to re-.

tard thecooling and enable the glass to be saved. This was carried outby the use of an inclosed chamber.

In carrying out our invention we do away with the use of the incloseddrawing-chamber and draw the sheet or sheets upwardly within the openair by heating or retarding the cooling of the edge portions of thesheet or sheets. By retarding the cooling of the edge portions weprevent the cracking of the sheets, as we have found that these cracksusually start from the edge and may be prevented by preventing rapidcooling of the edge portions. We also preferably draw a plurality ofsheets at the same time, retarding the cooling of their edges duringdrawing, so that the outer sheets protect the inner ones and avoidwarping and improper drawing.

In the drawings, in which we show one form of apparatus for carrying outour invention, 2 represents the pan or pot, into which the molten glassmay be fed through a spout or chute 3 from the furnace 4. This pot maybe supported upon posts 5 and 6, of which the posts 6 may be raised andlowered, so as to empty the refuse glass into a receptacle 7, the heatof the burners 8 in the chamber 9 assisting in this operation.

Over the pan we preferably provide watercooled bars 10, which may beturned into the position shown in Fig. 1 during drawing or swung intothe position at right angles thereto, soas to practically cover the pan.Water may be supplied to these shields through pipes 11 and 12, leadingfrom the supply and exhaust pipes 13 and 14. i

The baits 15 may be supported on a frame 16, lifted by hooks 17,connected by cords 18 with suitable lifting apparatus. The baits whenlowered extend between the inwardlyprojecting partitions or'baflies 19of the hollow side walls 20. Each of'these hollow walls is providedwithsuitable metal framing inclosing the hollow refractory wall, withits projections 19, and resting upon a car or truck 22, movable ontracks 23 by means of motive cylinder 24. These motive cylinders arehandcontrolled, so that the hollow side walls may be moved back andforth as desired. These walls are heated by burners 25, having flexiblepipes 26, forming branches from the main burners 8, the heat discharginginto the base of the wall-cavity and flowing out at its open top. Wherethe refractory projections are used, the wall may be or may not behollow and may or may not be heated, as the heat from the operation mayheat up the refractory projections sufficiently for our purpose withoutsupplying additional heat.

Instead of the refractory projections we may employ simply gas-burnerssuitably arranged to heat the edges of the sheets as they are drawn.

After the sheets are drawn up the desired distance, their edges beingheated during drawing or the cooling thereof retarded, their lower endsmay be severed from the glass in the pot and the drawing-frame thenlifted to allow the U-shaped frame 27 of the leer-car 28 to be movedunder the ends of the bait cross-frame. The bait-frame may then belowered on the car, which is moved into the leer 29 and graduallycarried through it. The entrance to the leer is protected by the valves30 and 31. After the one set of sheets is taken into the leer theleer-opening is closed, another bait-frame supported on thedrawing-ropes or supports, the glass in the not brought into suitablecondition, and another set of sheets drawn upwardly.

Before each set of sheets is moved laterally into the leer the hollowwalls are of course drawn back to allow the sheets to move sidewise,these Walls being moved into position again before the neXt drawingoperation.

The advantages of our invention result from the drawing of the sheet orsheets in the open air, which can be done by retarding the cooling oftheir edges only. This does away with the use of an incloseddrawing-chamber and makes the operation easier.

Many variations may be made in the form and arrangement of the drawingapparatus and the other parts without departing from our invention.

We claim 1. The method of forming glass sheets, consisting in drawing asheet upwardly from a glass-bath in the open air, and retarding thecooling of the edges of the sheet; substantially as described.

. 2. The method of forming glass sheets, consisting in drawing aplurality of glass sheets simultaneously and upwardly into the open air,and retarding the cooling of their edge portions during drawing;substantially as described.

3. The method of forming glass sheets, consisting in simultaneouslydrawing a plurality of glass sheets upwardly from a bath and within theopen air, applying heat to the edge portions of the sheets and thenpassing said sheets through an annealing-leer; substantially asdescribed.

4. The method of forming glass sheets, consisting in engaging the loweredge of a bait with the glass of a bath, drawing the sheet verticallyfrom the bath in the open air, and retarding the cooling of the edgeportions only ofthe sheet; substantially as described.

In testimony whereof we have hereunto set our hands.

JOHN H. LUBBERS. S. LAURENCE BODINE. Witnesses:

JOHN MILLER, H. M. CoRWIN.

